Welcome to UBL.XML.org.

This is the official community gathering place and information resource for the OASIS UBL (ISO/IEC 19845) International Standard. UBL defines a royalty-free library of standard electronic XML business documents such as purchase orders and invoices.

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I was asked today "where is the list of mandatory elements in UBL?". Perhaps the answer will help others.

There can be no such list of mandatory elements in UBL. One cannot simply scrape the UBL document models looking for BIEs that have a minimum cardinality of one. Determining the list of mandatory elements is an iterative process.

The Model Law on Electronic Transferable Records (MLETR) provides the trans-jurisdictional legal context for use of electronic transferable records that
are functionally equivalent to transferable documents and instruments, such as bills of lading, bills of exchange, promissory notes and
warehouse receipts.

Laws at country and sub-country levels are typically adapted to conform with UNCITRAL "Model Laws".

I am Laszlo Beloberk from the company Tradeshift. Until now we have been
successfully using UBL in 44 different countries. Now we started
looking into using it in China as well. Does anbody have any experience
using UBL in that region? Or is anyone familiar with the Chineese
invoicing systems including document types such as: Fapiao invoices,
Guazhang and DuiZhang documents?

The first public review of the OASIS Business Document Naming and Design Rules Version 1.1 proposed OASIS Standard with new rules for creating JSON validation artefacts for JSON documents, complete with the OASIS Committee Note of all UBL 2.1 document types as JSON schemas and all UBL 2.1 example documents as JSON documents, begins February 1, 2017 and closes April 1, 2017: